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Net Income per Common Share - Reconciliation of Numerator and Denominator of Basic and Diluted Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Earnings Per Share [Line Items]    
Net income $ 46,783 $ 47,241
Denominator for basic income per share for both Class A and Class B 47,732 48,505
Plus: Effect of dilutive equity awards 485 306
Denominator for diluted income per share for both Class A and Class B 48,217 48,811
Class A Nonvoting Common Stock    
Earnings Per Share [Line Items]    
Basic $ 0.98 $ 0.97
Diluted $ 0.97 $ 0.97
Class B Voting Common Stock    
Earnings Per Share [Line Items]    
Preferential dividends $ (736) $ (748)
Preferential dividends on dilutive stock options (8) (5)
Numerator for basic and diluted income per Class B Voting Common Share $ 46,039 $ 46,488
Basic $ 0.96 $ 0.96
Diluted $ 0.95 $ 0.95